It can be inferred from the passage that the author's explanation in the highlighted portions would be most weakened if which one of the following were true? A. Musicians who perform in modern orchestras generally receive more extensive training than did their nineteenth-century counterparts. B. Breaks between the movements of symphonies performed during the early nineteenth century often lasted longer than they do today because nineteenth-century musicians needed to retune their instruments between each movement. C. Early nineteenth-century orchestral musicians were generally as concerned with the audience's response to their music as are the musicians who perform today in modern orchestras. D. Early nineteenth-century audience applauded only perfunctorily after the first three movements of symphonies and conventionally withheld their most enthusiastic applause until the final movement was completed. E. Early nineteenth-century audiences were generally more knowledgeable about music than are their modern counterparts.